Layouts:

1. Fixed crash on OSX after change of the settings layout (PreferencesDialog should be destroyed before call of recreate_GUI)
2. Fixed dialog message during GUI recreation
3. In PreferencesDialog changed radio buttons view (under OSX they were bold)
4. slDlg mode - fixed switching between main frame and settings dialog (dialog->SetFocus() doesn't work under OSX, so we just hide it and show again)

src/slic3r/GUI/Preferences.hpp

@@ -23,10 +23,13 @@ class PreferencesDialog : public DPIDialog
 	wxSizer*                            m_icon_size_sizer;
 	wxRadioBox*							m_layout_mode_box;
     bool                                isOSX {false};
+	bool								m_settings_layout_changed {false};
 public:
 	PreferencesDialog(wxWindow* parent);
 	~PreferencesDialog() {}
 
+	bool settings_layout_changed() { return m_settings_layout_changed; }
+
 	void	build();
 	void	accept();